Pulley



(No Model.)

B. OROSSLEY, Jr.

PULLEY. No. 486,631. Patented Nov. 22, 1892.

UNITED STATES PATENT OFFICE.

ELI OROSSLEY, JR, OF -MANCHESTER, ENGLAND, ASSI GNOR TO CHARLES A. GOSLETT, OF CHICAGO, ILLINOIS.

PU LLEY.

SPECIFICATION forming part of Letters Patent No. 486,631, dated November 22, 1892. Application filed August 13, 1892. Serial No. 443,008. (No model.) Patented in England August 21 1890, No. 13,121.

To aZZ whom it may concern: tion of the length of the strip, are two open- Be it known that I, ELI CROSSLEY, Jr., a ings s, to receive cotters 3. When a strip is subject of the Queen of Great Britain, residplaced in position,its under surface between ing at Manchester,in the county of Lancaster, the lugs B is in contact with the surface of 55 England, have invented a new and useful Imthe base of the recess 25 and the openings 8 are provement in Pulleys, (for which I have obat the under surface of the rim A, and the tained a patent in Great Britain, No. 13,121, cotters s, when passed through the openings dated August 21, 1890,) of which the following 5, are in contact with and bear against the is a specification. under surface of the rim, whereby the rim at 60 1o My invention relates to an improvementin the recesses 25 is clamped between the cotters drums or pulleys adapted to transmit power and shoulders, afforded at the junction of the or be driven through the medium of belts or lugs with the strips, andthe strips thus held bands which pass over them and provided at rigidly in place. The outer surface of the intervals upon their circumferential faces strips B are preferably convex in cross-sec- 65 with strips of friction material to enhance tion and at their lateral edges extend fl s their gripping effect upon the belts or hands, with the outer surface of the rim A. The

My objects are to provide a drum or pulley strips thus afford convex protrusions of trioof the above class with friction-strips of an tional material, which grip thebelt a d ave improved construction and to provide ima tendency to prevent its s pp gy p 7 proved means for securing the strips in place. erence the strips are placed at comparatively- In the drawings, Figure 1 is a perspective short intervals apart around the rim A, so view of a drum or pulley provided with my that a belt will be engaged by a number of improvement; Fig. 2, a section taken on line the friction-strips at one time.

2 of Fig. 1; Fig. 3, a section taken on line 3 In the construction shown in Fig. 6 the re- 75 of Fig.2; Fig. 4, asection taken on the same cesses i for the strips B extend each only line as Fig. 2, but illustrating another conpart way across from side to side of the rim struction; Fig. 5, a section on line 5 of Fig. 4.; of the pulley, alternate recesses being toward Figs. 6, 7, 8, and 9,broken plan viewsof pulleyone edge of the rim and the alternate rerims, showing different Ways of applying my cesses intermediate of the others being toward 8:) 0 improvement thereto; and Fig. 10, a section the opposite side of the rim.

taken on line 10 of Fig. 9 and showing friction- In the construction shown in Fig. 7 the repieces employed in that construction. cesses t for the strips B extend all in the same A is a drum or pulley having a rim A. In direction at an angle to the perpendicular of the construction shown in all the figures, exthe sides of the rim A, and in the construc- 85 cept Fig. 9, the rim A is provided with shaltion shown in Fig.8 the recesses for the strips low recesses t, extending in a direction cross- B are in a line having abrupt angnlations wise of the rim. Extending through the rim giving a zigzag form. The strips B in Figs. 6, at the said recesses are openings 25. 7, and 8 may be constructed like those de- BB are pieces or stripsof friction material, scribed and fastened in place in the same 90 preferably of rubber,though they may be of manner.

any suitable material having a frictional In the construction shown in Figs. at and 5 property superior to that of the material of the recesses 23 are of dovetailed form in cross- 'WlllCll the rim A is formed. One form of the section, the openings if being of the width of strips B is that shown in Figs. 1, 2, and the bases of the said recesses. The strips are 5 5 They are of a length equal to that of the reon opposite sides, beveled down to a sharp cesses t and are provided on their under suredge, and are sprung into the recesses 23 to faceswith reduced extensions or lugsB, prefextend therein, as shown, the lugs passing erably cast integral with the strips, and through the openings 75 and the strips held which coincide with the openings 25 to pass in place by cotters s in the same manner as I00 through the latter, as shown. Extending before described, in connection with the conthrough each lug B, preferably in the direcstruction shown in Figs. 1, 2, and 3.

In the modification shown in Figs. 9 and 10, instead of the recessestof the elongated form shown in the other figures, lines of perforations or openings q are provided, the openings being countersunk at the outer surface of the rim to afford recesses. Pieces of friction material-such as rubber-having heads 9', fitting into the countersunk recesses, and reduced extensions or shanks g are placed in the said openings. Through the shanks g are openings to receive cotters s, which hold the pieces of friction material in place in the same manner described in connection with the strips B. The heads q are rounded, and when the pieces are placed in position they afford convex knobs or buttons upon the surface of the rim A.

A drum or pulley provided with my improvements in either of the forms described has in operation a greater gripping elfect upon a belt than any other pulley or drum of which I am aware, and while it affords greater driving-power to the device, permits the belts to be comparatively slack, It is well known that where belts are stretched tightly the wear and tear thereof in operation are great in proportion to their tension, and my construction, which permits the belts to be comparatively slack, has a tendency to prevent this wear and tear to a great degree.

Because in the main figure of the drawings I have illustrated the drum or pulley provided with friction-strips of the construction shown in Figs. 2 and 3, these strips are not to be regarded, necessarily, as the preferred form. In many cases, especially where the pulley is to be revolved at a high rate of speed, the strips shown in Figs. Jr and 5 set into dovetailed recesses t may be preferred.

Each recess 23 may be provided with any de sired number of openings 2f, the strip B being formed with as many reduced extensions or lugs B as there are openings to receive them.

Vhat I claim as new, and desire to secure by Letters Patent, is

1. In a belt drum or pulley, the combination of a rim thereon provided with openings through it and recesses in its outer surface at the said openings, pieces of friction material fitting into the said recesses to extend beyond the outer surface of the rim and provided with reduced extensions passing through the said openings, and securing means for the strips engaging the said reduced extensions at the under side of the rim, substantially as described.

2. In a belt drum or pulley, the combination of a rim thereon provided with openings through it and recesses in its outer surface at the said openings, pieces of friction material fitting into the said recesses to extend beyond the outer surface of the rim and provided with transversely-perforated reduced extensions passingthrough the said openings, and cotters bearing against the underside of the rim and engagingthe said reduced extensions at the perforations, substantially as and for the purpose set forth.

3. In a belt drum or pulley, the combination,with the rim, of elongated recesses formed therein at intervals around its periphery and extending in a direction crosswise of its circumference, openings through the rim at intervals in each of the said recesses, strips of friction material in the said recesses, projecting beyond the outer surface of the rim and provided with reduced extensions passing through the said openings, and securing means for the strips engaging the said reduced extensions at the under surface of the rim,substantially as described.

4. In a belt drum or pulley, the combination, with the rim, of dovetailed recesses formed therein at intervals around its periphery, openings through the rim at the said recesses, pieces of friction material of dovetail form in cross-section set into and fitting the said recesses projectingbeyond the outer surface of the rim and provided with perforated reduced extensions which pass through the said openings, and cotters extending through the perforations in the said reduced extensions and bearing against the under surface of the rim to secure the said pieces in place, substantially as described.

ELI OROSSLEY, JUNIOR.

In presence of ELI CROSSLEY, Senior. J. HOYLES. 

